feat(miniprogram): 温润东方风全面 UI 重设计

73 文件变更，覆盖全部 40 个页面 SCSS + TabBar 图标 + 组件样式。
统一赤陶主色 #C4623A + 暖米背景 + 衬线标题字体 + 12px 圆角体系。

apps/miniprogram/src/pages/followup/detail/index.scss

@@ -1,4 +1,5 @@
 @import '../../../styles/variables.scss';
+@import '../../../styles/mixins.scss';
 
 .detail-page {
   min-height: 100vh;
@@ -12,14 +13,12 @@
   border-radius: $r;
   padding: 28px;
   margin-bottom: 20px;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
+  box-shadow: $shadow-sm;
 }
 
 .detail-title {
+  @include section-title;
   font-size: 34px;
-  font-weight: bold;
-  color: $tx;
-  display: block;
   margin-bottom: 20px;
 }
 
@@ -84,14 +83,11 @@
   background: $card;
   border-radius: $r;
   padding: 28px;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
+  box-shadow: $shadow-sm;
 }
 
 .section-title {
-  font-size: 30px;
-  font-weight: bold;
-  color: $tx;
-  display: block;
+  @include section-title;
   margin-bottom: 16px;
 }
 
@@ -100,7 +96,7 @@
   min-height: 200px;
   font-size: 28px;
   color: $tx;
-  background: $bd-l;
+  background: $bg;
   border-radius: $r-sm;
   padding: 20px;
   box-sizing: border-box;
@@ -111,26 +107,28 @@
 
 .submit-btn {
   background: $pri;
-  border-radius: $r-sm;
+  border-radius: $r;
   padding: 24px;
   text-align: center;
 
+  &:active {
+    opacity: 0.85;
+  }
+
   &.disabled {
-    opacity: 0.6;
+    opacity: 0.5;
   }
 }
 
 .submit-btn-text {
   font-size: 30px;
-  color: white;
-  font-weight: bold;
+  color: #fff;
+  font-weight: 600;
 }
 
 .loading-state,
 .empty-state {
-  display: flex;
-  justify-content: center;
-  align-items: center;
+  @include flex-center;
   padding: 120px 0;
 }